Apparatus and method for extracting an ambient signal in an apparatus and method for obtaining weighting coefficients for extracting an ambient signal and computer program

US8588427B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Christian Uhle · Nuremberg, DE
• Juergen Herre · Erlangen, DE
• Stefan Geyersberger · Erlangen, DE
• Falko Ridderbusch · Erlangen, DE
• Andreas Walter · Egloffstein, DE
• Oliver Moser · Erlangen, DE

Key dates

• Filing date: Mar 26, 2008
• Grant date: Nov 19, 2013
• Expiry date: Mar 22, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R5/04
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for extracting an ambient signal from an input audio signal comprises a gain-value determinator configured to determine a sequence of time-varying ambient signal gain values for a given frequency band of the time-frequency distribution of the input audio signal in dependence on the input audio signal. The apparatus comprises a weighter configured to weight one of the sub-band signals representing the given frequency band of the time-frequency-domain representation with the time-varying gain values, to obtain a weighted sub-band signal. The gain-value determinator is configured to obtain one or more quantitative feature-values describing one or more features of the input audio signal and to provide the gain-value as a function of the one or more quantitative feature values such that the gain values are quantitatively dependent on the quantitative values. The gain value determinator is configured to determine the gain values such that ambience components are emphasized over non-ambience components in the weighted sub-band signal.